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You squat many times a week to build legs. You lift heavy weight above your head to build the shoulders. No need to add more leg work and lose focus on shoulders.

However as you progress don't rule out push press as an accessory to get your body used to handling heavier weight. I could not push past 47.5Kg until I started push-pressing 50-55Kg to allow my CNS to feel the heavier weight.

There is no doubt you are packing some strength however the form highlights the weight is too heavy. The same thing happened to me when getting to the 160lb+ range. The final part of the movement (to actually get the bar close to your chest) is being aided by your lower back and legs.

Personally I would (and did) drop the weight and focus on maintaining the back angle parallel with the floor, sit on your heels more so you cannot utilise anything other than your upper back and lats.

Do you mean the flaring of the elbows in the Rippetoe video? To me that looks like bad form.

OHP takes a lot of tweaking to get your forearms to stay vertical throughout the movement. Wide enough to allow this, but narrow enough to keep the triceps on top of the lats at the start of the press.

As an aside, I've recently found that a thumbless grip makes the whole lift feel a lot more natural for myself. (Same on the bench, but I refrain from that as I like having a throat)

On the deadlift try and get more early hip drive so the lift is more one single movement rather than two stages. As the bar passes the knees squeeze your gluten and drive the hips forward. This takes a mental queue - it does not come naturally.